module.exports = app => {
    const mongoose = require('mongoose')
    mongoose.connect('mongodb://127.0.0.1:27017/admin',{
        useNewUrlParser: true,
        useUnifiedTopology: true
    }).then(
        console.log('数据库连接成功！')
    ).catch(err => {
        console.log(err,'数据库连接失败');
    })
}